The Spanish Herrenknecht branch managers Francisco Avila Aranda and Juan Arroyo mentioned several factors to explain the speedy progress in the tunneling activities: the experienced construction site team of FCC Construccin S.A. and Construcciones Sanchez Dominguez-Sando S.A., the logistics system which was planned in detail and the tunnel boring machine which was precisely adapted to the geology consisting of hard limestone. Furthermore, the construction site team, excellently trained and coordinated by the construction company and the perfect logistics system contributed to this extraordinary performance.
Herrenknecht double shield breaks records in Spain Anonymous Mining Engineering; Mar 2009; 61, 3; Docstoc pg. T39 Reproduced with permission of the copyrig
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